I use email to the whole group. That way I can hit everyone at the same time, and all of my actors check their email daily. It also helps me manage my time, as I can check my email twice a day (once in the morning and once at night) and get any issues identified without having to stop what I am doing during the day to take care of actor issues.

Do you think there would be interest if there was an all in one app that would allow your volunteers to sign up and select the date they can work, allow you to mass send out texts to your volunteers and record their responses? It would also would allow you to show all your actors and assign them to your rooms and give you a list of the contacts emergency contact info.

We use a great free text message site that is mainly for Teachers called Remind 101, you can schedule messages as well. It seems to be our best option so far. We also send emails and have a Facebook group.